[Feature Request] Remove/Exclude files that won't have their name changed

I use ARen a lot for my images, as a matter of fact it's how my images get sorted the way I like them. My only problem is when I get a bit lazy and drag a whole folder instead of just dragging the pics that I need renamed, it can get a bit slow because of all the images that are already renamed that get added to the list. I think it'd be nice to have a button in the List section, where you can remove errorneous items and such, that removes and files in the list that won't have their names changed by the current renaming method.